The role of individual decision‑making in the manufacturing of bone retouchers

Bone retouchers, while often underrated, stand out as widespread tools throughout the Palaeolithic, typically linked to breaking bones for marrow extraction. Although bone retouchers are commonly considered a by-product of butchering activities, the possibility of intentional manufacturing has been rarely considered but should not be dismissed. In our experimental protocol, we explore decision-making processes involved in manufacturing bone retouchers, focusing on how these decisions are guided by intentional production rather than solely marrow extraction. The results indicate that individuals employ specific techniques and make technological decisions, rapidly acquiring experience in retoucher manufacturing that extends beyond mere intuition. The choice of bone-breaking technique(s) reflects the intention behind either marrow extraction or producing suitable bone fragments for retouchers. This decision-making process is heavily influenced by the morphology of the bone, presenting challenges that individuals learn to overcome during the experiment. The analysis of the experimental percussion marks suggests that certain marks on specific skeletal elements indicate intentional bone retoucher manufacturing. We then propose a likelihood grid to assess the reliability of traces on each skeletal element in inferring intentional manufacturing. Given the abundance of bone retouchers in Middle Palaeolithic contexts, a thorough investigation into the intentionality behind their manufacturing processes could significantly impact their relevance within other Palaeolithic bone industries.